Automatically refactor more exception testing to use new JUnit rules

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=179072309

javatests/google/registry/tools/GenerateAuctionDataCommandTest.java

@@ -20,6 +20,7 @@ import static google.registry.testing.DatastoreHelper.newContactResourceWithRoid
 import static google.registry.testing.DatastoreHelper.newDomainApplication;
 import static google.registry.testing.DatastoreHelper.newSunriseApplication;
 import static google.registry.testing.DatastoreHelper.persistResource;
+import static google.registry.testing.JUnitBackports.assertThrows;
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.joda.time.DateTimeZone.UTC;
 
@@ -320,19 +321,16 @@ public class GenerateAuctionDataCommandTest extends CommandTestCase<GenerateAuct
 
   @Test
   public void testFailure_missingTldName() throws Exception {
-    thrown.expect(ParameterException.class);
-    runCommand();
+    assertThrows(ParameterException.class, () -> runCommand());
   }
 
   @Test
   public void testFailure_tooManyParameters() throws Exception {
-    thrown.expect(IllegalArgumentException.class);
-    runCommand("xn--q9jyb4c", "foobar");
+    assertThrows(IllegalArgumentException.class, () -> runCommand("xn--q9jyb4c", "foobar"));
   }
 
   @Test
   public void testFailure_nonexistentTld() throws Exception {
-    thrown.expect(IllegalArgumentException.class);
-    runCommand("foobarbaz");
+    assertThrows(IllegalArgumentException.class, () -> runCommand("foobarbaz"));
   }
 }